﴿ سَخَّرَهَا عَلَيْهِمْ سَبْعَ لَيَالٍۢ وَثَمَٰنِيَةَ أَيَّامٍ حُسُومًۭا فَتَرَى ٱلْقَوْمَ فِيهَا صَرْعَىٰ كَأَنَّهُمْ أَعْجَازُ نَخْلٍ خَاوِيَةٍۢ ﴾

“which He willed against them for seven nights and eight days without cease, so that in the end thou couldst see those people laid low [in death], as though they were so many [uprooted] trunks of hollow palm trees:”

Please check ayah 69:12 for complete tafsir.